26 MPG combined isn’t the main reason someone buys the 2018 Mercedes-Benz AMG CLA45 4matic. Buyers aren’t comparing this car to a Prius. They want fast acceleration, sharp handling, and the prestige of the AMG badge. Fuel economy is a secondary concern, acknowledged as they buy the car. They know they’re getting performance in return.

City and highway performance

The EPA estimates the CLA45 gets 23 MPG in the city and 30 MPG on the highway. The city number, though seemingly low, shows stop-and-go traffic, where the turbocharger is always working and the engine is trying to maintain momentum. The highway number is more reasonable, achievable when cruising steadily where the car settles into a comfortable, efficient pace. Using the accelerator heavily, which is common in this car, will reduce both numbers.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2018 Mercedes-Benz AMG CLA45 4matic at $2,250. This is based on driving 15,000 miles per year, with a mix of city and highway driving, and the average national price for premium fuel, which this engine needs. If you drive more aggressively, drive more miles, or live where fuel is more expensive, expect to pay more each year.

Real-world expectations

Forget the EPA numbers if you often drive the CLA45 hard. Drivers should expect to average about 22-24 MPG in mixed driving. Hard acceleration, track days, or mostly city driving will lower that number. However, those who prioritize less gas and drive gently can probably match or exceed the EPA’s 26 MPG combined figure.

How it compares

The AMG CLA45 isn’t unique in its class. The Audi S3, with its 2.0-liter turbo and quattro all-wheel drive, has similar performance and gets around 25 MPG combined. BMW’s M240i xDrive coupe, a rear-wheel-drive biased car with all-wheel drive available, delivers around 25 MPG combined from its turbocharged inline-six. While those cars might get slightly better fuel economy, the CLA45 stands out with its aggressive looks, powerful engine, and a more exciting driving style. Buyers usually choose the CLA45 because they want that driving excitement more than better MPG.

Tips to maximize efficiency

Accelerate gently. Avoid aggressive starts and quick stops, as these use a lot of fuel. The CLA45’s turbocharger is responsive, but it also uses more fuel when used a lot. Gentle throttle inputs are more efficient.

Use the car’s driving modes. The “Comfort” setting will soften throttle response and change shift points for better gas mileage. Though tempting, avoid “Sport” or “Sport+” modes unless you want maximum performance. Those modes keep the engine in its powerband, which burns a lot of gas.

Keep the correct tire pressure. Underinflated tires increase rolling resistance, making the engine work harder and use more fuel. Regularly check your tire pressure and inflate them to the recommended levels on the driver’s side door.

Don’t idle. If you’ll be waiting for more than a minute, turn off the engine. Idling uses fuel without moving. The CLA45’s engine starts quickly, making this an easy way to save fuel.

Join an owner’s club or forum to learn from others. Experienced CLA45 owners often share tips for maximizing fuel efficiency specific to the car. You can also review all Mercedes Benz fuel economy data or find AMG MPG across all years.